Quelle ProfilerMarkers.cpp Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "ProfilerMarkers.h"

#include "MainThreadUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/Atomics.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/mscom/Utils.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/Services.h"
#include "nsCOMPtr.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsISupportsImpl.h"
#include "nsString.h"
#include "nsXULAppAPI.h"

#include <objbase.h>
#include <objidlbase.h>

// {9DBE6B28-E5E7-4FDE-AF00-9404604E74DC}
static const GUID GUID_MozProfilerMarkerExtension = {
    0x9dbe6b28, 0xe5e7, 0x4fde, {0xaf, 0x0, 0x94, 0x4, 0x60, 0x4e, 0x74, 0xdc}};

namespace {

class ProfilerMarkerChannelHook final : public IChannelHook {
  ~ProfilerMarkerChannelHook() = default;

public:
  ProfilerMarkerChannelHook() : mRefCnt(0) {}

  // IUnknown
  STDMETHODIMP QueryInterface(REFIID aIid, void** aOutInterface) override;
  STDMETHODIMP_(ULONG) AddRef() override;
  STDMETHODIMP_(ULONG) Release() override;

  /**
   * IChannelHook exposes six methods: The Client* methods are called when
   * a client is sending an IPC request, whereas the Server* methods are called
   * when a server is receiving an IPC request.
   *
   * For our purposes, we only care about the client-side methods. The COM
   * runtime invokes the methods in the following order:
   * 1. ClientGetSize, where the hook specifies the size of its payload;
   * 2. ClientFillBuffer, where the hook fills the channel's buffer with its
   *    payload information. NOTE: This method is only called when ClientGetSize
   *    specifies a non-zero payload size. For our purposes, since we are not
   *    sending a payload, this method will never be called!
   * 3. ClientNotify, when the response has been received from the server.
   *
   * Since we want to use these hooks to record the beginning and end of a COM
   * IPC call, we use ClientGetSize for logging the start, and ClientNotify for
   * logging the end.
   *
   * Finally, our implementation responds to any request matching our extension
   * ID, however we only care about main thread COM calls.
   */

  // IChannelHook
  STDMETHODIMP_(void)
  ClientGetSize(REFGUID aExtensionId, REFIID aIid,
                ULONG* aOutDataSize) override;

  // No-op (see the large comment above)
  STDMETHODIMP_(void)
  ClientFillBuffer(REFGUID aExtensionId, REFIID aIid, ULONG* aDataSize,
                   void* aDataBuf) override {}

  STDMETHODIMP_(void)
  ClientNotify(REFGUID aExtensionId, REFIID aIid, ULONG aDataSize,
               void* aDataBuffer, DWORD aDataRep, HRESULT aFault) override;

  // We don't care about the server-side notifications, so leave as no-ops.
  STDMETHODIMP_(void)
  ServerNotify(REFGUID aExtensionId, REFIID aIid, ULONG aDataSize,
               void* aDataBuf, DWORD aDataRep) override {}

  STDMETHODIMP_(void)
  ServerGetSize(REFGUID aExtensionId, REFIID aIid, HRESULT aFault,
                ULONG* aOutDataSize) override {}

  STDMETHODIMP_(void)
  ServerFillBuffer(REFGUID aExtensionId, REFIID aIid, ULONG* aDataSize,
                   void* aDataBuf, HRESULT aFault) override {}

private:
  void BuildMarkerName(REFIID aIid, nsACString& aOutMarkerName);

private:
  mozilla::Atomic<ULONG> mRefCnt;
};

HRESULT ProfilerMarkerChannelHook::QueryInterface(REFIID aIid,
                                                  void** aOutInterface) {
  if (aIid == IID_IChannelHook || aIid == IID_IUnknown) {
    RefPtr<IChannelHook> ptr(this);
    ptr.forget(aOutInterface);
    return S_OK;
  }

  return E_NOINTERFACE;
}

ULONG ProfilerMarkerChannelHook::AddRef() { return ++mRefCnt; }

ULONG ProfilerMarkerChannelHook::Release() {
  ULONG result = --mRefCnt;
  if (!result) {
    delete this;
  }

  return result;
}

void ProfilerMarkerChannelHook::BuildMarkerName(REFIID aIid,
                                                nsACString& aOutMarkerName) {
  aOutMarkerName.AssignLiteral("ORPC Call for ");

  nsAutoCString iidStr;
  mozilla::mscom::DiagnosticNameForIID(aIid, iidStr);
  aOutMarkerName.Append(iidStr);
}

void ProfilerMarkerChannelHook::ClientGetSize(REFGUID aExtensionId, REFIID aIid,
                                              ULONG* aOutDataSize) {
  if (aExtensionId == GUID_MozProfilerMarkerExtension) {
    if (NS_IsMainThread()) {
      nsAutoCString markerName;
      BuildMarkerName(aIid, markerName);
      PROFILER_MARKER(markerName, IPC, mozilla::MarkerTiming::IntervalStart(),
                      Tracing, "MSCOM");
    }

    if (aOutDataSize) {
      // We don't add any payload data to the channel
      *aOutDataSize = 0UL;
    }
  }
}

void ProfilerMarkerChannelHook::ClientNotify(REFGUID aExtensionId, REFIID aIid,
                                             ULONG aDataSize, void* aDataBuffer,
                                             DWORD aDataRep, HRESULT aFault) {
  if (NS_IsMainThread() && aExtensionId == GUID_MozProfilerMarkerExtension) {
    nsAutoCString markerName;
    BuildMarkerName(aIid, markerName);
    PROFILER_MARKER(markerName, IPC, mozilla::MarkerTiming::IntervalEnd(),
                    Tracing, "MSCOM");
  }
}

}  // anonymous namespace

static void RegisterChannelHook() {
  RefPtr<ProfilerMarkerChannelHook> hook(new ProfilerMarkerChannelHook());
  mozilla::DebugOnly<HRESULT> hr =
      ::CoRegisterChannelHook(GUID_MozProfilerMarkerExtension, hook);
  MOZ_ASSERT(SUCCEEDED(hr));
}

namespace {

class ProfilerStartupObserver final : public nsIObserver {
  ~ProfilerStartupObserver() = default;

public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIOBSERVER
};

NS_IMPL_ISUPPORTS(ProfilerStartupObserver, nsIObserver)

NS_IMETHODIMP ProfilerStartupObserver::Observe(nsISupports* aSubject,
                                               const char* aTopic,
                                               const char16_t* aData) {
  if (strcmp(aTopic, "profiler-started")) {
    return NS_OK;
  }

  RegisterChannelHook();

  // Once we've set the channel hook, we don't care about this notification
  // anymore; our channel hook will remain set for the lifetime of the process.
  nsCOMPtr<nsIObserverService> obsServ(mozilla::services::GetObserverService());
  MOZ_ASSERT(!!obsServ);
  if (!obsServ) {
    return NS_OK;
  }

  obsServ->RemoveObserver(this, "profiler-started");
  return NS_OK;
}

}  // anonymous namespace

namespace mozilla {
namespace mscom {

void InitProfilerMarkers() {
  if (!XRE_IsParentProcess()) {
    return;
  }

  MOZ_ASSERT(NS_IsMainThread());
  if (!NS_IsMainThread()) {
    return;
  }

  if (profiler_is_active()) {
    // If the profiler is already running, we'll immediately register our
    // channel hook.
    RegisterChannelHook();
    return;
  }

  // The profiler is not running yet. To avoid unnecessary invocations of the
  // channel hook, we won't bother with installing it until the profiler starts.
  // Set up an observer to watch for this.
  nsCOMPtr<nsIObserverService> obsServ(mozilla::services::GetObserverService());
  MOZ_ASSERT(!!obsServ);
  if (!obsServ) {
    return;
  }

  nsCOMPtr<nsIObserver> obs(new ProfilerStartupObserver());
  obsServ->AddObserver(obs, "profiler-started", false);
}

}  // namespace mscom
}  // namespace mozilla

quality100%

¤ Dauer der Verarbeitung: 0.15 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.